A.N. Khosla is renowned for his work on the design of weirs and hydraulic structures on permeable foundations. His theory of independent variables and the use of flow nets provided a scientific basis for calculating uplift pressure and exit gradients, which are critical for ensuring the stability of dams and barrages.

Furrow irrigation is a method where furrows are made and water is applied using a small discharge to favour water infiltration while advancing down the field. In this gravity plays the role of providing just enough water for suitable plants to grow.In the furrow method of irrigation, only $${\frac{3}{4}^{{\text{th}}}}$$ of the furrow is wetted.

The percentage of irrigated land varies significantly by region and national policy. While the provided answer is 27%, this figure is often cited in historical or specific regional contexts regarding net irrigated area versus total net sown area. It highlights the ongoing challenge of expanding irrigation infrastructure to reduce dependence on rain-fed agriculture.

In hydraulic engineering, the 'Standard Project Flood' (SPF) represents the flood that would result from the most severe combination of meteorological and hydrological conditions considered reasonably characteristic of the region. If a flood event exceeds the magnitude for which a reservoir was specifically designed, it is often categorized in relation to these standard protection levels.

According to Lacey's regime theory, the hydraulic mean radius (R) is calculated using the formula R = 5/2 * (V^2 / f), where V is velocity and f is the silt factor. Substituting V=1 and f=1 gives R = 2.5 meters.

An effluent stream is one that receives water from the groundwater table, meaning the water table is higher than the stream bed. However, the question describes a scenario where the river loses water to the groundwater (recharging it), which is technically an influent or 'losing' stream. Given the provided answer key, we note a potential terminology conflict regarding standard hydrological definitions.

A unit hydrograph is defined as the hydrograph of direct runoff resulting from one unit of effective rainfall (e.g., 1 cm or 1 inch) distributed uniformly over a drainage basin for a specified 'unit duration'. It is a fundamental tool in hydrology for predicting streamflow responses to various storm events.

Cyclonic precipitation is generated by the convergence of air masses within a low-pressure system. As air moves toward the center of the low-pressure area, it is forced upward, leading to cooling, condensation, and subsequent rainfall. This process is closely linked to the movement of weather fronts, such as cold or warm fronts, which are characteristic of cyclonic activity, distinguishing it from orographic or convective precipitation mechanisms.

A hydraulic jump is a localized phenomenon in open channel flow where supercritical flow (high velocity, low depth) abruptly changes to subcritical flow (low velocity, high depth). This transition is accompanied by significant turbulence, energy dissipation, and a sudden increase in water depth, often used in spillways and canal structures to prevent downstream erosion.

A penstock is a high-pressure pipe or conduit used in hydroelectric power plants to convey water from a reservoir or forebay to the turbine. It is designed to withstand the high pressure generated by the head of water, ensuring efficient energy transfer to the turbine blades.